21-25 July 2019
Connecticut Convention Center, Level 6
US/Eastern timezone

C2Or1C-01: Numerical investigation of the efficiency potential of a cryogen-free VM type pulse tube cooler

23 Jul 2019, 11:00
15m
Level 6, Room 22-23 ()

Level 6, Room 22-23

Speaker

Prof. Wei Dai (Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, University of Chinese Academy of Sciences)

Description

Vuilleumier (VM) type pulse tube cooler is a novel kind of cryocooler to obtain liquid helium temperature which had been experimentally verified. However, the efficiency is not satisfying. Based on previous work on a low pressure ratio system, a numerical investigation that explore the effect of high pressure ratios on refrigeration performance is presented in this paper. The research system is a cryogen-free in which a Stirling type pulse tube cooler is used to provide the cooling power required for the thermal compressor and offers adjustable pre-cooling temperature for optimum efficiency. Firstly, by increasing the displacer swept volume to increase the pressure ratio, the dimensions of main components were optimized with the lowest no-load temperature as the optimization target. Then the dependence of system performance on average pressure, frequency and pre-cooling temperature were studied. Finally, the effect of pre-cooling temperature on overall cooling efficiency at 5 K was studied. Compared with the previous low efficiency under low pressure ratio, a higher relative Carrot efficiency of 1.05% was predicted with an average pressure of 2.5 MPa, a frequency of 3 Hz and pressure ratio of 1.89. Further optimization is underway.

Primary authors

Mr Yunhao Cui (Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, University of Chinese Academy of Sciences) Prof. Wei Dai (Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, University of Chinese Academy of Sciences) Ms Yanan Wang (Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, University of Chinese Academy of Sciences) Xiaotao Wang (Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, University of Chinese Academy of Sciences) Prof. Ercang Luo (Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, University of Chinese Academy of Sciences) Mr Jian Zhu (Lihan Thermoacoustics Co. Ltd)

Presentation Materials

There are no materials yet.